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  1. /*
  2.  * Copyright (c) 2001-2004 Jakub Jermar
  3.  * All rights reserved.
  4.  *
  5.  * Redistribution and use in source and binary forms, with or without
  6.  * modification, are permitted provided that the following conditions
  7.  * are met:
  8.  *
  9.  * - Redistributions of source code must retain the above copyright
  10.  *   notice, this list of conditions and the following disclaimer.
  11.  * - Redistributions in binary form must reproduce the above copyright
  12.  *   notice, this list of conditions and the following disclaimer in the
  13.  *   documentation and/or other materials provided with the distribution.
  14.  * - The name of the author may not be used to endorse or promote products
  15.  *   derived from this software without specific prior written permission.
  16.  *
  17.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27.  */
  28.  
  29. /** @addtogroup ia32   
  30.  * @{
  31.  */
  32. /**
  33.  * @file
  34.  * @brief EGA driver.
  35.  */
  36.  
  37. #include <arch/drivers/ega.h>
  38. #include <putchar.h>
  39. #include <mm/page.h>
  40. #include <mm/as.h>
  41. #include <arch/mm/page.h>
  42. #include <synch/spinlock.h>
  43. #include <arch/types.h>
  44. #include <arch/asm.h>
  45. #include <memstr.h>
  46. #include <console/chardev.h>
  47. #include <console/console.h>
  48. #include <sysinfo/sysinfo.h>
  49. #include <ddi/ddi.h>
  50.  
  51. /*
  52.  * The EGA driver.
  53.  * Simple and short. Function for displaying characters and "scrolling".
  54.  */
  55.  
  56. static parea_t ega_parea;   /**< Physical memory area for EGA video RAM. */
  57.  
  58. SPINLOCK_INITIALIZE(egalock);
  59. static uint32_t ega_cursor;
  60. static uint8_t *videoram;
  61.  
  62. static void ega_putchar(chardev_t *d, const char ch);
  63.  
  64. chardev_t ega_console;
  65. static chardev_operations_t ega_ops = {
  66.     .write = ega_putchar
  67. };
  68.  
  69. static void ega_move_cursor(void);
  70.  
  71. void ega_init(void)
  72. {
  73.     uint8_t hi, lo;
  74.    
  75.     videoram = (uint8_t *) hw_map(VIDEORAM, SCREEN * 2);
  76.     outb(0x3d4, 0xe);
  77.     hi = inb(0x3d5);
  78.     outb(0x3d4, 0xf);
  79.     lo = inb(0x3d5);
  80.     ega_cursor = (hi << 8) | lo;
  81.  
  82.     chardev_initialize("ega_out", &ega_console, &ega_ops);
  83.     stdout = &ega_console;
  84.    
  85.     ega_parea.pbase = VIDEORAM;
  86.     ega_parea.vbase = (uintptr_t) videoram;
  87.     ega_parea.frames = 1;
  88.     ega_parea.cacheable = false;
  89.     ddi_parea_register(&ega_parea);
  90.  
  91.     sysinfo_set_item_val("fb", NULL, true);
  92.     sysinfo_set_item_val("fb.kind", NULL, 2);
  93.     sysinfo_set_item_val("fb.width", NULL, ROW);
  94.     sysinfo_set_item_val("fb.height", NULL, ROWS);
  95.     sysinfo_set_item_val("fb.address.physical", NULL, VIDEORAM);
  96. }
  97.  
  98. static void ega_display_char(char ch)
  99. {
  100.     videoram[ega_cursor * 2] = ch;
  101. }
  102.  
  103. /*
  104.  * This function takes care of scrolling.
  105.  */
  106. static void ega_check_cursor(void)
  107. {
  108.     if (ega_cursor < SCREEN)
  109.         return;
  110.  
  111.     memcpy((void *) videoram, (void *) (videoram + ROW * 2), (SCREEN - ROW) * 2);
  112.     memsetw(videoram + (SCREEN - ROW) * 2, ROW, 0x0720);
  113.     ega_cursor = ega_cursor - ROW;
  114. }
  115.  
  116. void ega_putchar(chardev_t *d __attribute__((unused)), const char ch)
  117. {
  118.     ipl_t ipl;
  119.  
  120.     ipl = interrupts_disable();
  121.     spinlock_lock(&egalock);
  122.  
  123.     switch (ch) {
  124.     case '\n':
  125.         ega_cursor = (ega_cursor + ROW) - ega_cursor % ROW;
  126.         break;
  127.     case '\t':
  128.         ega_cursor = (ega_cursor + 8) - ega_cursor % 8;
  129.         break;
  130.     case '\b':
  131.         if (ega_cursor % ROW)
  132.             ega_cursor--;
  133.         break;
  134.     default:
  135.         ega_display_char(ch);
  136.         ega_cursor++;
  137.         break;
  138.     }
  139.     ega_check_cursor();
  140.     ega_move_cursor();
  141.  
  142.     spinlock_unlock(&egalock);
  143.     interrupts_restore(ipl);
  144. }
  145.  
  146. void ega_move_cursor(void)
  147. {
  148.     outb(0x3d4, 0xe);
  149.     outb(0x3d5, (uint8_t) ((ega_cursor >> 8) & 0xff));
  150.     outb(0x3d4, 0xf);
  151.     outb(0x3d5, (uint8_t) (ega_cursor & 0xff));
  152. }
  153.  
  154. /** @}
  155.  */
  156.